rule win_unidentified_104_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.unidentified_104."
        info = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.6.0"
        signator_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.unidentified_104"
        malpedia_rule_date = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        malpedia_license = "CC BY-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

    /* DISCLAIMER
     * The strings used in this rule have been automatically selected from the
     * disassembly of memory dumps and unpacked files, using YARA-Signator.
     * The code and documentation is published here:
     * https://github.com/fxb-cocacoding/yara-signator
     * As Malpedia is used as data source, please note that for a given
     * number of families, only single samples are documented.
     * This likely impacts the degree of generalization these rules will offer.
     * Take the described generation method also into consideration when you
     * apply the rules in your use cases and assign them confidence levels.
     */


    strings:
        $sequence_0 = { 4c8bf2 e8???????? ba20000000 498bce 488bf0 ff15???????? 84c0 }
            // n = 7, score = 100
            //   4c8bf2               | add                 edi, 0x27
            //   e8????????           |                     
            //   ba20000000           | dec                 eax
            //   498bce               | sub                 eax, ebx
            //   488bf0               | dec                 eax
            //   ff15????????         |                     
            //   84c0                 | add                 eax, -8

        $sequence_1 = { 4c8b0424 488bf1 48c1ee3f 488d0409 4833f0 498b8298000000 4903c3 }
            // n = 7, score = 100
            //   4c8b0424             | mov                 eax, edx
            //   488bf1               | dec                 eax
            //   48c1ee3f             | neg                 eax
            //   488d0409             | dec                 eax
            //   4833f0               | shl                 eax, 0x1a
            //   498b8298000000       | dec                 eax
            //   4903c3               | add                 ecx, eax

        $sequence_2 = { 48895c2408 57 4883ec20 488d1d33620100 488d3d2c620100 eb12 488b03 }
            // n = 7, score = 100
            //   48895c2408           | je                  0x13a
            //   57                   | je                  0x375
            //   4883ec20             | dec                 esp
            //   488d1d33620100       | lea                 ecx, [eax + 1]
            //   488d3d2c620100       | dec                 esp
            //   eb12                 | mov                 dword ptr [esp + 0x20], ecx
            //   488b03               | dec                 eax

        $sequence_3 = { eb10 4c8d8de0010000 488bd3 e8???????? }
            // n = 4, score = 100
            //   eb10                 | dec                 eax
            //   4c8d8de0010000       | lea                 ecx, [ebp + 0x48]
            //   488bd3               | inc                 ecx
            //   e8????????           |                     

        $sequence_4 = { 4d85c0 0f84a7000000 488bc4 48895808 48896810 48897018 48897820 }
            // n = 7, score = 100
            //   4d85c0               | mov                 dword ptr [ebx], ecx
            //   0f84a7000000         | dec                 eax
            //   488bc4               | lea                 edx, [ebx + 8]
            //   48895808             | dec                 eax
            //   48896810             | lea                 ecx, [eax + 8]
            //   48897018             | movups              xmmword ptr [edx], xmm0
            //   48897820             | dec                 eax

        $sequence_5 = { 488b442410 490fafc6 4801842428010000 49634004 480faf442440 4801842428010000 }
            // n = 6, score = 100
            //   488b442410           | mov                 dword ptr [esp + 8], eax
            //   490fafc6             | dec                 eax
            //   4801842428010000     | imul                ecx, ebx
            //   49634004             | dec                 eax
            //   480faf442440         | add                 ecx, eax
            //   4801842428010000     | dec                 ecx

        $sequence_6 = { 4c8b6918 4489542468 8b4304 4c8d0cc0 }
            // n = 4, score = 100
            //   4c8b6918             | dec                 eax
            //   4489542468           | shl                 ebp, 0x30
            //   8b4304               | dec                 ecx
            //   4c8d0cc0             | xor                 ebp, eax

        $sequence_7 = { 4c03f8 41897c2408 488b7c2438 4189742414 488b742430 498d8f00000002 41895c2418 }
            // n = 7, score = 100
            //   4c03f8               | lea                 eax, [0x1732c]
            //   41897c2408           | dec                 eax
            //   488b7c2438           | mov                 dword ptr [ebx], eax
            //   4189742414           | dec                 eax
            //   488b742430           | mov                 dword ptr [ebx], ecx
            //   498d8f00000002       | dec                 eax
            //   41895c2418           | lea                 edx, [ebx + 8]

        $sequence_8 = { 0f8423030000 488d8530040000 4889442420 4533c9 4533c0 418bd6 488b4c2448 }
            // n = 7, score = 100
            //   0f8423030000         | inc                 ecx
            //   488d8530040000       | imul                eax, dword ptr [eax + 0x10], 0x13
            //   4889442420           | dec                 esp
            //   4533c9               | mov                 dword ptr [ebp + 0x100], ebp
            //   4533c0               | dec                 esp
            //   418bd6               | mov                 dword ptr [ebp + 0x108], edi
            //   488b4c2448           | inc                 esp

        $sequence_9 = { 48c1ea20 4833d3 498b9ba8000000 4803c2 4c33f0 48898424a0000000 498bce }
            // n = 7, score = 100
            //   48c1ea20             | dec                 eax
            //   4833d3               | imul                eax, dword ptr [esp + 0x78]
            //   498b9ba8000000       | dec                 eax
            //   4803c2               | add                 ecx, eax
            //   4c33f0               | dec                 ecx
            //   48898424a0000000     | arpl                word ptr [eax + 4], ax
            //   498bce               | dec                 eax

    condition:
        7 of them and filesize < 263168
}